Hi Morgan,
Sure, happy to help. Totally understand that if the hardware is not available, it’s difficult to test.
I took another image off the Internet, a JPG, to remove the “cooking the raw” piece of it. You can find the original image here: https://i.kinja-img.com/gawker-media/image/upload/t_original/b0mr8r0pi47ydytwgb1y.jpg
My computer’s display settings (admittedly not telling much):
This basically says 2560x1600. The screen is scaled 2x as is the default for all Macs.
The RT full screen image:
The Apple Photos full screen image, for comparison:
And then, zooming in on the two above images, you can see the difference:
